JP6974920B2 - Cooling fan arrangement structure - Google Patents

Description

The present invention relates to the technical field of an arrangement structure of a cooling fan that supplies cooling air to a heat exchanger.

Generally, a construction machine such as a power shovel is provided with various heat exchangers such as an oil cooler, a radiator, and a condenser for an air conditioner, and a cooling fan for supplying cooling air to these heat exchangers. As such a cooling fan, a fan that is interlocked and connected to the engine output shaft via a belt, a fan that is rotated by a hydraulic motor, and the like have been generally used, but in recent years, an engine has not been installed. DC motor type electric fans are also used from the viewpoints of increasing number of electric power shovels, layout freedom, and ease of speed control. Further, when arranging these cooling fans and heat exchangers on the vehicle body, in the case of a fan interlocked with the engine output shaft, usually, the heat exchangers are arranged on the outdoor side of the fan in the engine room. It is configured to draw in outside air with a fan to cool the heat exchanger and the inside of the engine room. On the other hand, when it is required to arrange the fan on the upstream side of the cooling air from the heat exchanger so that the electronic parts are not easily affected by heat, such as an electric fan, or because of the layout, the heat exchanger It is also known that a cooling fan is arranged on the outdoor side of the above (see, for example, Patent Document 1).
By the way, construction machines such as power shovels are often used in harsh work sites where earth and sand, dust, etc. are scattered, so heat exchangers are easily clogged, and regular maintenance such as cleaning, inspection, and repair is performed. Is required. For this reason, normally, the storage room in which the heat exchanger is stored is provided with an opening that can be accessed from outside the vehicle, and the opening is covered with a cover that can be opened and closed, and the heat exchanger is opened from the opening by opening the cover. It is required to be configured so that it can be maintained. In this case, if the heat exchanger is arranged on the outdoor side of the cooling fan, the heat exchanger can be easily accessed from the opening simply by opening the cover. However, when the cooling fan is arranged on the outdoor side of the heat exchanger as in Patent Document 1, the cooling fan becomes an obstacle and cannot access the heat exchanger, so that the heat exchanger cannot be accessed. At the time of maintenance, it is necessary to remove the cooling fan or the casing to which the cooling fan is assembled, which takes time and labor, and has a problem of inferior maintainability.
On the other hand, in a construction machine (wheel loader) in which a cooling fan is arranged on the outdoor side of the heat exchanger, the blower unit incorporating the cooling fan is placed in a closed position facing the back surface of the heat exchanger and the back surface of the heat exchanger. It has been proposed that the structure is rotatable with an open position for exposing the surface (see, for example, Patent Document 2). In this case, even if the cooling fan is arranged on the outdoor side of the heat exchanger, the heat exchanger can be accessed from the opening by opening the blower unit.

JP-A-2015-1040643 WO2018 / 123201 No.

However, in the case of Patent Document 2, when the heat exchanger is maintained, first, a cover (grill) that covers the opening so as to be openable and closable is opened, and then the blower unit is positioned in the open position. An open operation is required. Moreover, two opening / closing mechanisms, one for opening / closing the cover and the other for opening / closing the blower unit, are required, and there is a problem that the number of parts is large and the structure is complicated. There is a problem to be solved.

The present invention, which was created for the purpose of solving these problems in view of the such circumstances above, a first aspect of the invention, a heat exchanger disposed in the retract and chamber, storage chamber The exterior cover that covers the exterior cover, the opening that opens and closes with the hinge as the fulcrum between the closed state that closes the opening and the open state that opens the opening, and the heat exchanger are cooled. In a construction machine equipped with a cooling fan that supplies wind, when arranging the cooling fan on the outdoor side of the heat exchanger, the heat exchanger is placed at a position facing the open / close cover in the closed state, and the open / close cover is used. It is provided with an outer surface to which a hinge serving as a fulcrum for opening and closing swing of the opening / closing cover is attached, and an inner surface which is integrally fixed to the outer surface and is located on the indoor side of the outer surface in a closed state of the opening / closing cover. and then, put preparative cooling fan on the inner surface of the cover, while opening the cooling fan to the heat exchanger in a closed state of the closing cover to supply cooling air to face, open-close cover of the hinge as a fulcrum The cooling fan is arranged so that the opening / closing cover and the cooling fan are separated from the heat exchanger so that the heat exchanger can be accessed from the opening.
A second aspect of the present invention, in claim 1, cover is a one inner surface and the closed cross section with an outer surface, the outer surface of the open-closed cover having a vent cooling air passes It is an arrangement structure of a cooling fan characterized by.
According to a third aspect of the present invention, the cooling fan is attached to the inner surface of the opening / closing cover in a state where most of the cooling fan is fitted in the space between the inner surface and the outer surface of the closed cross-sectional structure. It is a characteristic arrangement structure of a cooling fan.
According to any one of claims 1 to 3, the invention of claim 4 abuts on the outer peripheral side of the heat exchanger with the open / close cover on the outer peripheral side of the cooling fan in a closed state of the open / close cover to cool the heat exchanger. It is a cooling fan arrangement structure characterized in that a duct member forming an air passage between the fan and the fan is provided, and an airtight member is provided at a contact portion between the duct member and the opening / closing cover.
The invention of claim 5 is in any one of claims 1 to 3, in which the open / close cover on the outer peripheral side of the cooling fan is in contact with the outer peripheral side of the heat exchanger in the closed state of the open / close cover to cool the heat exchanger. It is a cooling fan arrangement structure characterized in that a duct member forming an air passage between the fan and the duct member is provided, and an airtight member is provided at a contact portion between the duct member and the heat exchanger.
The invention of claim 6 is an arrangement structure of a cooling fan according to any one of claims 1 to 5, wherein the cooling fan is an electric fan driven by an electric motor.
The invention according to claim 7 is an arrangement structure of a cooling fan according to any one of claims 1 to 6, wherein a plurality of cooling fans are attached to the opening / closing cover.
The invention of claim 8 is in any one of claims 1 to 7, wherein the opening / closing cover is a heat exchanger or a heat exchanger support member for mounting and supporting the heat exchanger in a storage chamber via a hinge. It is an arrangement structure of a cooling fan characterized by being supported by swinging open and close.

According to the first aspect of the present invention, the cooling fan is arranged on the outdoor side of the heat exchanger, but the maintainability can be improved and the structure can be simplified.
According to the second aspect of the present invention, the cooling fan can be easily attached to the opening / closing cover having the ventilation holes, and the rigidity of the opening / closing cover can be increased.
According to the third aspect of the present invention, the cooling fan can be effectively protected, and the amount of protrusion of the cooling fan from the inner side surface of the opening / closing cover to the indoor side can be suppressed.
According to the invention of claim 4 or 5, even if the heat exchanger and the cooling fan are separated from each other when the open / close cover is opened, the heat exchanger and the cooling fan are separated from each other when the open / close cover is closed. It is possible to form an airtight air passage, which can contribute to the improvement of cooling efficiency.
According to the invention of claim 6, the electric fan can be arranged in a state of being less susceptible to heat.
According to the invention of claim 7, it is possible to provide a number of cooling fans corresponding to the number, capacity, type and the like of heat exchangers.
According to the invention of claim 8, the positional relationship between the heat exchanger and the cooling fan attached to the open / close cover can be easily adjusted, and the heat exchanger or the heat exchanger support member also serves as the support frame for the open / close cover. Therefore, it is possible to use the members for both purposes.

It is a side view of a power shovel. It is a figure which shows the arrangement state of the equipment in the upper swing body. It is a perspective view of the main part in a state where the opening / closing cover is opened. It is sectional drawing of the main part with the opening / closing cover open. It is a figure which shows the heat exchanger unit. It is a figure which shows the attachment to the opening / closing cover of a cooling fan. It is a figure which shows the duct in the state of being in contact with an opening / closing cover. It is a figure which shows the open / close cover and a heat exchanger unit in a closed state. It is a horizontal sectional view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, 1 is a power excavator which is an example of a construction machine, and the power excavator 1 is an electric excavator whose power source is electric power in the present embodiment, but a crawler type lower traveling body 2 and the lower portion thereof. It is composed of an upper swivel body 3 that is swivelably supported by the traveling body 2, a front working portion 4 mounted on the upper swivel body 3, and the like. The front-back, left-right directions in the following description are based on the front-back, left-right directions of the upper swivel body 3.

Reference numeral 5 denotes a swivel frame that serves as a base for the upper swivel body 3, and a battery storage chamber 7 for accommodating a battery 6 as a power source is provided at the rear of the swivel frame 5. A cab mounting portion 9 on which the cab 8 is mounted is provided on the front left side of the 7. Further, a main storage chamber 10 is provided in the front left and right center portion and the front right side of the battery storage chamber 7, and the main storage chamber 10 is driven by a motor supplied with electric power from the battery 6 (not shown). Various devices and tanks such as a hydraulic pump 11 driven by the motor, a hydraulic oil tank 12, and a heat exchanger unit 13 described later are housed. Further, a valve storage chamber 14 is provided on the front right side of the main storage chamber 10, and various hydraulic actuators provided in the power shovel 1 (for example, a boom 4a constituting the front working portion 4) are provided in the valve storage chamber 14. , Oil supply to the boom cylinder 4d, arm cylinder 4e, bucket cylinder 4f that expands and contracts to swing the arm 4b and bucket 4c, and the traveling motor (not shown) that drives the lower traveling body 2 to travel. A control valve 15 for controlling exhaust is housed.

The battery storage chamber 7, the main storage chamber 10, and the valve storage chamber 14 are covered with exterior covers 16, 17, and 18, respectively, but the right side surface of the exterior cover 17 that covers the main storage chamber 10 has a large opening 19. The opening 19 is covered with an opening / closing cover 20 described later so as to be openable / closable. In the present embodiment, the main storage chamber 10 corresponds to a storage chamber having an opening of the present invention.

In the present embodiment, the heat exchanger unit 13 mainly includes first and second heat exchangers 21 and 22 arranged vertically adjacent to each other and these first and second heat exchangers 21 and 22. It is composed of a heat exchanger support frame (corresponding to the heat exchanger support member of the present invention) 23 for attaching and supporting the floor frame 5a (a part of the swivel frame 5) of the storage chamber 10, and the heat thereof. The exchanger unit 13 is arranged at the right end of the main storage chamber 10 in a state of being close to the front half side of the opening 19 of the exterior cover 17. As a result, the heat exchanger unit 13 can be easily accessed from the opening 19 by opening the opening / closing cover 20 that covers the opening 19 so as to be openable and closable. In the present embodiment, as the first and second heat exchangers, an oil cooler for cooling the hydraulic oil and a condenser for the air conditioner are provided.

The heat exchanger support frame 23 is an intermediate frame that connects a pair of front and rear vertical frames 23a and 23b, an upper frame 23c that connects the upper portions of the vertical frames 23a and 23b, and an intermediate frame that connects the upper and lower intermediate portions of the vertical frames 23a and 23b. It is composed of a lower frame 23e that connects the lower parts of the vertical frames 23a and 23b, a fixing bracket 23f for fixing the lower ends of the vertical frames 23a and 23b to the floor frame of the main storage chamber 10, and the like. The first heat exchanger 21 is located on the upper side and the second heat exchanger 22 is located on the lower side in the frame formed by the front and rear vertical frames 23a and 23b, the upper frame 23c, the intermediate frame 23d, and the lower frame 23e. Built in state.

Further, in the heat exchanger support frame 23, a duct (corresponding to the duct member of the present invention) 25 that forms an air passage between the first and second heat exchangers 21 and 22 and the cooling fan 24 described later. Is installed. The duct 25 includes a short square tube-shaped duct body portion 25a extending from the heat exchanger support frame 23 toward the opening 19 side so as to surround the outer peripheral sides of the first and second heat exchangers 21 and 22, and the duct. It is provided with a flange portion 25b formed on the base end side of the main body portion 25a and fixed to the heat exchanger support frame 23 with screws, and an airtight member mounting portion 25c formed on the tip end side of the duct main body portion 25a. An airtight member 26 made of an elastic material is mounted on the airtight member mounting portion 25c. The airtight member 26 comes into contact with the open / close cover 20 in the closed state to ensure airtightness of the air passage, and also functions as a cushioning material when the duct 25 and the open / close cover 20 come into contact with each other.

Further, a pair of upper and lower hinges 27 for supporting the opening / closing cover 20 so as to be openable / closable are attached to the vertical frame 23a on the front side of the heat exchanger support frame 23, respectively, via hinge brackets 28. The hinge bracket 28 has a first mounting piece 28a attached to a bracket mounting seat 23g fixed to a vertical frame 23a on the front side of a heat exchanger support frame 23 and a second mounting piece 27b attached to one hinge piece 27b of the hinge 27. It is formed to include 28b and a connecting piece portion 28c that connects the upper and lower end portions of the first and second mounting pieces 28a and 28b. Further, the hinge 27 includes a hinge pin 27a, one hinge piece 27b attached to the second mounting piece 28b of the hinge bracket 28, and the other hinge attached to the hinge mounting portion 20a at the leading edge end portion of the opening / closing cover 20. It is formed from a piece 27c.

On the other hand, as described above, the opening / closing cover 20 covers the opening 19 on the right side surface of the main storage chamber 10 so as to be openable / closable, and the other hinge piece of the hinge 27 is attached to the leading edge end portion thereof. A hinge mounting portion 20a to which the 27c is mounted is formed. Then, as is clear from FIGS. 4 and 9 , the opening / closing cover 20 swings open / close to the front vertical frame 23a of the heat exchanger support frame 23 with the hinge 27 attached to the hinge mounting portion 20a as a fulcrum. In the closed state where the opening / closing cover 20 is closed while being supported, the heat exchanger is arranged in the main storage chamber 10 so as to be close to the front half side of the opening 19 as described above. The unit 13 is configured to face the open / close cover 20 in close proximity to each other with a predetermined interval.

Here, as is clear from FIG. 4, the front half side of the opening / closing cover 20 facing the heat exchanger unit 13 is an outer surface 20c to which the hinge 27 is attached and an inner surface integrally fixed to the outer surface 20c. It is formed in a closed cross-sectional structure provided with 20b, and the inner side surface 20b is provided with a fan mounting hole 20d to which the cooling fan 24 is mounted, while the outer surface 20c is provided with a ventilation hole through which cooling air passes. A ventilation plate 29 having a punched metal structure is attached. In this embodiment, three cooling fans 24 are provided so as to be arranged in the vertical direction, and three fan mounting holes 20d are provided corresponding to the three cooling fans 24, and each fan is mounted. A ventilation plate 29 is attached to a position on the outside of the vehicle in the hole 20d.

As the cooling fan 24, an electric fan is adopted in the present embodiment, and the short cylindrical fan shroud 24a, the electric motor 24b arranged at the center of the fan shroud 24a, and the inside of the fan shroud 24a. A plurality of rotary blades 24c and the like arranged in the fan shroud 24b and driven by the electric motor 24b are provided, and a cooling fan 24 is provided on the outer peripheral portion of the fan shroud 24a in the outer peripheral portion of the fan mounting hole 20d of the opening / closing cover 20. A mounting seat 24d for fixing is formed. When the fan shroud 24a is fitted into the fan mounting hole 20d of the opening / closing cover 20, the mounting seat 24d comes into contact with the inner side surface 20b on the outer peripheral side of the fan mounting hole 20d, and the corresponding mounting is in contact with the fan shroud 24d. By fixing the seat 24d with screws, the cooling fan 24 is mounted and fixed to the inner side surface 20b in a state where most of the cooling fan 24 is fitted into the space between the inner side surface 20b and the outer side surface 20c of the closed cross-sectional structure. It has become. The electric wire 24e (shown in FIG. 3) connected to the electric motor 24b of the cooling fan 24 has a hinge 27 so that the electric wire 24e is not pulled or disturbed when the opening / closing cover 20 is opened / closed. It is designed to be guided into the main storage room 10 through the vicinity.

The cooling fan 24 attached to the inner side surface 20b of the open / close cover 20 is provided so as to face the open / close cover 20 in the closed state at a predetermined interval by closing the open / close cover 20. Closely opposed to the heat exchanger unit 13. When the cooling fan 24 is driven in this state, outside air is sucked through the ventilation holes of the ventilation plate 29, and the sucked outside air becomes cooling air and is supplied to the first and second heat exchangers 21 and 22. It has become. Further, in the closed state of the open / close cover 20, the airtight member 26 attached to the tip of the duct 25 described above comes into contact with the inner side surface 20b of the open / close cover on the outer peripheral side of the cooling fan 24, whereby the first and second heats are generated. An air passage is formed between the exchangers 21 and 22 and the cooling fan 24 to enable efficient cooling. On the other hand, by opening the open / close cover 20, the cooling fan 24 attached to the open / close cover 20 is separated from the heat exchanger unit 13, whereby the first and second heat exchangers 21 and 22 are exposed from the outside of the vehicle. It is easily accessible.
In the figure, 30 is a latch attached to the rear end portion of the opening / closing cover 20, and 30a is a latch receiving portion attached to a frame erected in the main storage chamber 10, when the opening / closing cover 20 is closed. When the latch 30 engages with the latch receiving portion 30a, the open / close cover 20 is held in the closed state.

In this embodiment configured as described above, the power shovel 1 includes heat exchangers (first and second heat exchangers) 21 and 22 and a cooling fan 24 that supplies cooling air to the heat exchangers 21 and 22. However, the main storage chamber 10 in which the heat exchangers 21 and 22 are housed has an opening 19, and the opening 19 is covered with an openable / closable cover 20. In this, when arranging the cooling fan 24 on the outdoor side of the heat exchangers 21 and 22, the heat exchangers 21 and 22 are arranged at positions facing the open / close cover 20 in the closed state, while the cooling fan 24 is arranged. It is attached to the open / close cover 20, and when the open / close cover 20 is closed, the cooling fan 24 faces the heat exchangers 21 and 22 to supply cooling air, while when the open / close cover 20 is open, the open / close cover 20 is supplied. By separating the cooling fan 24 attached to the heat exchangers 21 and 22, the heat exchangers 21 and 22 can be easily accessed from the opening 19.

As described above, in this embodiment, by attaching the cooling fan 24 to the opening / closing cover 20, the cooling fan 24 is arranged outside the heat exchangers 21 and 22, thereby forming the cooling fan 24. An opening / closing cover 20 that covers the opening 19 so that the opening 19 can be opened and closed when performing maintenance such as cleaning, inspection, and repair of the heat exchangers 21 and 22 while the motor 24b is made less susceptible to heat. The heat exchangers 21 and 22 can be easily accessed from the opening 19 simply by opening, which can greatly contribute to the improvement of maintainability. Moreover, since the cooling fan 24 is attached to the opening / closing cover 20, no dedicated operation or mechanism for opening / closing the cooling fan 24 itself is required, the operation is easier, the number of parts is reduced, and the structure is simplified. Can contribute to the conversion.

Further, in this case, the opening / closing cover 20 has a closed cross-sectional structure including an inner side surface 20b and an outer side surface 20c, and a cooling fan 24 is attached to the inner side surface of the opening / closing cover 20, while the outer surface of the opening / closing cover 20 is attached. A ventilation plate 29 having a ventilation hole through which cooling air passes is attached to the 20c. By having the open / close cover 20 having a closed cross-sectional structure in this way, it becomes easy to attach the cooling fan 24 to the open / close cover 20 having ventilation holes, and the rigidity of the open / close cover 20 can be increased. Further, in this case, the cooling fan 24 is configured to be attached to the inner side surface 20b in a state where most of the cooling fan 24 is fitted into the space portion between the inner side surface 20b and the outer side surface 20c of the closed cross-sectional structure. As a result, the cooling fan 24 can be effectively protected, and the amount of protrusion of the cooling fan 24 from the inner side surface 20b of the opening / closing cover to the indoor side can be suppressed.

Further, in this case, on the outer peripheral side of the heat exchangers 21 and 22 (in the present embodiment, the heat exchanger support frame 23 to which the heat exchangers 21 and 22 are attached), the outer periphery of the cooling fan 24 with the opening / closing cover 20 closed. A duct 25 is provided in contact with the opening / closing cover 20 on the side to form an air passage between the heat exchangers 21 and 22 and the cooling fan 24, and the duct 25 is in contact with the opening / closing cover 20. An airtight member 26 is provided in the portion. As a result, even if the heat exchangers 21 and 22 and the cooling fan 24 are separated from each other when the open / close cover 20 is opened, the heat exchangers 21 and 22 and the cooling fan 24 are separated from each other when the open / close cover 20 is closed. An airtight air passage can be formed between them, which can contribute to the improvement of cooling efficiency.

Further, the opening / closing cover 20 is supported by a heat exchanger support frame 23 for mounting and supporting the heat exchangers 21 and 22 in the main storage chamber 10 via a hinge 27 so as to be openable / closable. This makes it easier to adjust the positional relationship between the heat exchangers 21 and 22 and the cooling fan 24 attached to the open / close cover 20, for example, as compared with the case where the open / close cover is movably supported on the vehicle body side frame for opening and closing. In addition to being able to do this, the heat exchanger support frame 23 also serves as the support frame for the opening / closing cover 20, so that the members can also be used.

Needless to say, the present invention is not limited to the above embodiment, for example. In the above embodiment, the duct is provided on the outer peripheral side of the heat exchanger, but the heat exchanger abuts on the outer peripheral side of the heat exchanger with the open / close cover closed to the open / close cover on the outer peripheral side of the cooling fan. While a duct member that forms an air passage between the duct member and the cooling fan is provided, an airtight member may be provided at the contact portion between the duct member and the heat exchanger. Further, in the above embodiment, the airtight member is mounted on the duct side, but the airtight member may be provided on the opening / closing cover side or the heat exchanger side that abuts on the duct.
Further, in the above embodiment, the first and second heat exchangers 21 and 22 are shown as the heat exchangers arranged in the storage chamber, and the oil cooler and the air conditioner condenser are used as the first and second heat exchangers. As an example, the number of heat exchangers, the types of heat exchangers, the arrangement relationship between heat exchangers when multiple heat exchangers are provided, etc. are appropriate depending on the construction machine on which the heat exchangers are installed. Set. For example, in a construction machine equipped with an engine, a radiator or an intercooler is provided as a heat exchanger, and a plurality of heat exchangers are arranged so as to be adjacent to the left and right with respect to the flow of cooling air. It may be arranged so that it overlaps the flow of cooling air in the front-rear direction.
Further, in the above embodiment, three cooling fans are provided side by side, but the number and arrangement of the cooling fans are appropriately set according to the number, capacity, week, etc. of the heat exchangers. NS. Further, in the above embodiment, the electric fan is adopted as the cooling fan, but the cooling fan is not limited to the electric fan, and even if the fan is driven by a hydraulic motor, for example, the cooling fan is heat-exchanged for the convenience of layout. The present invention can be carried out when it is desired to dispose of the vessel on the outdoor side of the vessel.
Further, in the above embodiment, the opening / closing cover is configured to be movably supported for opening / closing by the heat exchanger support frame (heat exchanger support member), but the heat exchanger support member as in the above embodiment. If the outer shell of the heat exchanger itself has a strong structure, the opening / closing cover can be movably supported on the outer shell of the heat exchanger itself. .. Further, in the above embodiment, the opening / closing cover is provided with the surface direction facing the front-rear direction, and is configured to open / close and swing with the front edge portion as a fulcrum, but the trailing edge portion side or the upper side. It may be configured to open and close with the edge side or the lower edge side as a fulcrum, and if the opening / closing cover is provided so that the surface direction faces the left-right direction, the left edge side or the right edge side may be used. Of course, it may be configured to open and close and swing as a fulcrum.
Further, in the above embodiment, when the ventilation holes are provided on the outer surface of the opening / closing cover, the ventilation plate having the ventilation holes is attached to the outer surface, but the ventilation holes are provided on the outer surface itself. Of course, it may be a new one.
Furthermore, the present invention is not limited to power shovels, and can be applied to various construction machines provided with heat exchangers.

The present invention can be applied to a heat exchanger and a construction machine provided with a cooling fan for cooling the heat exchanger.

10 Main storage room 19 Opening 20 Opening / closing cover 20b Inner side surface 20c Outer side surface 21 First heat exchanger 22 Second heat exchanger 23 Heat exchanger support frame 24 Cooling fan 25 Duct 26 Airtight member 27 Hinge 29 Ventilation plate

Claims (8)

A heat exchanger disposed in the retract and chamber, and an outer cover for covering the housing chamber, an opening which is open to the external instrumentation cover, a hinge and an open state to open the closed state and the opening for closing the opening In a construction machine equipped with an open / close cover that swings open and close as a fulcrum and a cooling fan that supplies cooling air to the heat exchanger, the heat exchanger is closed when the cooling fan is placed on the outdoor side of the heat exchanger. The opening / closing cover is arranged at a position facing the opening / closing cover, and the opening / closing cover is integrally fixed to the outer surface to which the hinge serving as the fulcrum of the opening / closing swing of the opening / closing cover is attached, and the opening / closing cover is closed. and those with an inner surface located interior side of the outer surface, attach preparative cooling fan on the inner surface of the cover, open cooling fan to the heat exchanger in a closed state of the closing cover to face the cooling air On the other hand, by opening the open / close cover with the hinge as a fulcrum, the cooling fan is separated from the heat exchanger together with the open / close cover so that the heat exchanger can be accessed from the opening. The arrangement structure of the cooling fan. In claim 1, the opening and closing cover are intended closed cross section with an inner surface and an outer surface, the outer surface of the open closing cover of the cooling fan, characterized in that it comprises a vent cooling air passes Arrangement structure. 2. Installation structure. In any one of claims 1 to 3, the air passage between the heat exchanger and the cooling fan is in contact with the open / close cover on the outer peripheral side of the cooling fan in the closed state of the open / close cover on the outer peripheral side of the heat exchanger. A cooling fan arrangement structure, characterized in that an airtight member is provided at a contact portion between the duct member and the opening / closing cover, while the duct member forming the is provided. In any one of claims 1 to 3, the air passage between the heat exchanger and the cooling fan abuts on the outer peripheral side of the heat exchanger with the open / close cover on the outer peripheral side of the cooling fan in the closed state. A cooling fan arrangement structure, characterized in that an airtight member is provided at a contact portion between the duct member and the heat exchanger, while the duct member forming the is provided. The arrangement structure of the cooling fan according to any one of claims 1 to 5, wherein the cooling fan is an electric fan driven by an electric motor. The arrangement structure of the cooling fan according to any one of claims 1 to 6, wherein a plurality of cooling fans are attached to the open / close cover. In any one of claims 1 to 7, the opening / closing cover is swingably supported by a heat exchanger or a heat exchanger support member for mounting and supporting the heat exchanger in a storage chamber via a hinge. The arrangement structure of the cooling fan, which is characterized by being.

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